Using with DynamoDB

With the Global Setup/Teardown and Async Test Environment APIs, Jest can work smoothly with DynamoDB.

Use jest-dynamodb Preset

Jest DynamoDB provides all required configuration to run your tests using DynamoDB.

First, install @shelf/jest-dynamodb

yarn add @shelf/jest-dynamodb --dev

Specify preset in your Jest configuration:

{
 "preset": "@shelf/jest-dynamodb"
}

Create jest-dynamodb-config.js and define DynamoDB tables

See Create Table API

module.exports = {
 tables: [
 {
 TableName: `files`,
 KeySchema: [{AttributeName: 'id', KeyType: 'HASH'}],
 AttributeDefinitions: [{AttributeName: 'id', AttributeType: 'S'}],
 ProvisionedThroughput: {ReadCapacityUnits: 1, WriteCapacityUnits: 1},
 },
 // etc
 ],
};

Configure DynamoDB client

const {DocumentClient} = require('aws-sdk/clients/dynamodb');
 
const isTest = process.env.JEST_WORKER_ID;
const config = {
 convertEmptyValues: true,
 ...(isTest && {
 endpoint: 'localhost:8000',
 sslEnabled: false,
 region: 'local-env',
 }),
};
 
const ddb = new DocumentClient(config);

Write tests

it('should insert item into table', async () => {
 await ddb
 .put({TableName: 'files', Item: {id: '1', hello: 'world'}})
 .promise();
 
 const {Item} = await ddb.get({TableName: 'files', Key: {id: '1'}}).promise();
 
 expect(Item).toEqual({
 id: '1',
 hello: 'world',
 });
});

There's no need to load any dependencies.

See documentation for details.